map 观察者模式

Map<int, string> mapStudent;

       mapStudent.insert(pair<int, string>(1, “student_one”));

       mapStudent.insert(pair<int, string>(2, “student_two”));

       mapStudent.insert(pair<int, string>(3, “student_three”));

       map<int, string>::iterator  iter;

       for(iter = mapStudent.begin(); iter != mapStudent.end(); iter++)

{

       Cout<<iter->first<<”   ”<<iter->second<<end;

}

18.观察者模式，IMessageObserver,map< DWORD,list<MESSAGE_OBSERVER*> > mapObservers,vector;

list<MESSAGE_OBSERVER*> listob;

map< DWORD,list<MESSAGE_OBSERVER*> > mapObservers;

//获得事件注册接口

void CMessageManager::QueryObservers( const DWORD& guidMessage, std::list<IMessageObserver*>& listOb )
{
//EnterCriticalSection(&m_cs);
 if( mapObservers.find( guidMessage) == mapObservers.end() )
 {
//  LeaveCriticalSection(&m_cs);
  return;
 }

 list<MESSAGE_OBSERVER*>& listOb2 = mapObservers[guidMessage];

//注册一类事件
void CMessageManager::AttachMessage( const DWORD& guidMessage, IMessageObserver* pObserver,MESSAGE_OBSERVER_PRIORITY enumPri )
{
 
 MESSAGE_OBSERVER* pMo = new MESSAGE_OBSERVER;
 pMo->enumMessageObserverPriority = enumPri;
 pMo->pMessageObserver = pObserver;

EnterCriticalSection(&m_cs);

 if( mapObservers.find(guidMessage) != mapObservers.end() )
 {
  list<MESSAGE_OBSERVER*>& listOb = mapObservers[guidMessage]; 
  list<MESSAGE_OBSERVER*>::iterator it = listOb.begin();

  for(;it != listOb.end();it++ )
  {
   if( (*it)->enumMessageObserverPriority >= enumPri )
   {
    listOb.insert(it,pMo);
    break;
   }
  }
  if( it == listOb.end() )
  {
   listOb.push_back(pMo);
  }
 }
 else
 {
  list<MESSAGE_OBSERVER*> listob;
  listob.push_back(pMo);
  mapObservers[guidMessage] = listob;  
 }

LeaveCriticalSection(&m_cs);
}

 for( list<MESSAGE_OBSERVER*>::iterator it = listOb2.begin(); it != listOb2.end(); it++ )
 {
  listOb.push_back((*it)->pMessageObserver);
 }
//LeaveCriticalSection(&m_cs);
}

//反注册一类事件
void CMessageManager::DetachMessage( const DWORD& guidMessage, IMessageObserver* pObserver )
{
EnterCriticalSection(&m_cs);
 if( mapObservers.find(guidMessage) == mapObservers.end() )
 {
  LeaveCriticalSection(&m_cs);
  return;
 }

 list<MESSAGE_OBSERVER*>& listOb = mapObservers[guidMessage];

 for( list<MESSAGE_OBSERVER*>::iterator it = listOb.begin(); it != listOb.end(); it++ )
 {
  if( (*it)->pMessageObserver == pObserver )
  {
   delete (*it);
   listOb.erase(it);
   break;
  }
 }

LeaveCriticalSection(&m_cs);
}